He staggered up the stairs; thanks to the stash of cash (a new compact car here, nothing more, even with the premium he'd had to pay, but a young fortune before the turn of the century), some period clothes scrounged-like the Dilbert T-shirt and baggy jeans he had on-from secondhand stores, and the boots, those suitcases weren't light, and he'd never been in better shape than he could help. The backpack in which he carried his PowerBook and VR mask did nothing to make him more graceful, either.

Once he got up to the second floor, he paused and listened hard. "Yes!" he said when he heard nothing.

Except for Bill down below, he was the only person here.

He went into the men's room, piled one suitcase on the other, and sat down on them. Then he took the laptop out of its case. He plugged the VR mask into its jack, then turned on the computer. As soon as it came up, he put on the mask. The world went black, then neutral gray, then neutral… neutral: no color at all, just virtual reality waiting to be made real.

It all took too long. He wished he could do this back at his desk, with an industrial-strength machine. But he didn't dare take the chance. This building had been here nineteen years ago. This men's room had been here nineteen years ago. He'd done his homework as well as he could. But his homework hadn't been able to tell him where the goddamn cubicle partitions were back before the turn of the century.

And so… the john. He took a deep breath. "Run program superstrings-slash-virtual reality-slash-not so virtual," he said.

The PowerBook quivered, ever so slightly, on his lap. His heart thudded. Talk about your moments of truth.

Either he was as smart as he thought he was, or Garth or Sean or somebody would breeze in and ask, "Justin, what the hell are you doing?"

A string in space-time connected this place now to its earlier self, itself in 1999. As far as Justin knew, nobody but him had thought of accessing that string, of sliding along it, with VR technology. When the simulation was good enough, it became the reality-for a while, anyhow. That was what the math said. He thought he'd done a good enough job here.